What is the most likely impression in a patient with a subtle neonatal seizure characterized by upward eye rolling without tonic stiffening, secondary to coagulase‑negative Staphylococcus infection?

Neonatal Bacterial Meningitis Secondary to Coagulase-Negative Staphylococcus

The most probable impression is neonatal bacterial meningitis with subtle seizures, given the upward eye rolling without tonic stiffening in the context of coagulase-negative Staphylococcus infection.

Clinical Reasoning

Seizure Characteristics in Neonates

The described seizure pattern—upward eye rolling without extremity stiffening—is consistent with subtle neonatal seizures, which are the most common clinical seizure type in this age group 1.

• Subtle seizures are the predominant clinical manifestation in both preterm and term neonates, occurring in 68-71% of electrographically confirmed seizures 1
• These seizures characteristically include ocular phenomena such as eye deviation, sustained eye opening, and repetitive blinking 2
• Upward eye deviation is a recognized component of subtle seizures, often occurring in an oblique upward direction 3
• The absence of tonic stiffening does not exclude seizure activity, as subtle seizures frequently lack the classic motor manifestations seen in older children 1

Critical Diagnostic Consideration

Eyes remain open during 88% of electroclinical neonatal seizures 4. This is an important distinguishing feature, as persistent eye closure during a paroxysmal event makes an electroclinical seizure unlikely in neonates 4.

Infectious Etiology

Coagulase-negative Staphylococcus (CoNS) is the most commonly isolated pathogen in the NICU and can cause meningitis, though it more frequently causes bacteremia 5.

• Neonatal meningitis presents with nonspecific symptoms including irritability, poor feeding, respiratory distress, and seizures in 9-34% of cases 6
• Seizures occurring beyond the seventh day of life are more likely related to infection rather than hypoxic-ischemic injury 6
• Early-onset meningitis is associated with approximately 10-fold increased risk of epilepsy, with culture-positive meningitis showing even higher risk (IRR 16.04) 7

Diagnostic Imperative

Cerebrospinal fluid examination is mandatory 6. The ESCMID guidelines provide Grade A recommendation that bacterial meningitis in neonates can present solely with nonspecific symptoms, and characteristic clinical signs may be absent 6.

• The diagnostic accuracy of clinical characteristics in neonatal meningitis is presumed to be low 6
• Neonatal meningitis cannot be ruled out by clinical examination alone 6
• A low threshold should be maintained for performing lumbar puncture in neonates with suspected bacterial meningitis 6

Clinical Pitfalls to Avoid

• Do not rely on clinical examination alone to exclude meningitis—fever is present in only 6-39% of neonatal meningitis cases 6
• Do not assume the absence of tonic-clonic activity excludes seizures—subtle seizures are the most common type and may only manifest as eye deviation 1
• Do not dismiss CoNS as a contaminant without proper clinical correlation—true bacteremia occurs in approximately 32% of CoNS-positive cultures in neonates 8
• Consider continuous EEG monitoring as clinical manifestations of neonatal seizures are often subtle or absent, and electroclinical "uncoupling" is common 2

Immediate Management Priorities

Given the high morbidity and mortality associated with neonatal bacterial meningitis:

• Obtain CSF examination urgently unless contraindications exist 6
• Initiate appropriate antimicrobial therapy targeting CoNS (typically vancomycin) 9
• Arrange neuroimaging (MRI preferred when stable) to assess for complications and prognostic information 6
• Institute continuous EEG monitoring to detect subclinical seizures 2